岩矿测试2026，Vol.45Issue(1)：73-85,13.DOI:10.15898/j.ykcs.202506090158
页岩油储层孔隙度测试方法优化及在四川盆地侏罗系中的应用
Optimization of Porosity Testing Methods for Shale Oil Reservoirs and Application in the Jurassic System of the Sichuan Basin
摘要
Abstract
Porosity is a core parameter in the evaluation of shale oil reservoirs.The accuracy of its measurement is constrained by two main issues:the lack of standardized pretreatment procedures(oil washing and drying)and an unclear error propagation mechanism resulting from the selection of different volume parameters(bulk volume Vb,grain volume Vg,and pore volume Vp).To systematically analyze the influencing factors on porosity test results and establish a high-precision testing method,8 sets of 16 core samples from Jurassic shale oil reservoirs in the Sichuan Basin were selected.Comparative porosity experiments were conducted using differentiated pretreatment workflows(with/without oil washing,gradient temperature/duration drying)and measurements of different volume parameters(Vb,Vg,Vp),with reference materials introduced to optimize the measurement method.The results showed the following:(1)Oil washing significantly released pore space,with an average absolute increase in porosity of 0.32%,particularly more pronounced in low-maturity samples(Ro<1.2%),where the increase reached up to 0.56%.(2)Drying temperatures exceeding 105℃led to the removal of interlayer water in clay minerals and a systematic reduction in pore volume(average decrease of 4.2%),while drying at 90-105℃for 24-36 h was identified as the optimal parameter balancing efficient dehydration and structural preservation.(3)Among volume parameter measurements,the error in Vb measurement was the primary source of porosity data dispersion(its error was on average 3.8 times that of Vp error).(4)The optimized direct measurement method(measuring Vp and Vg)significantly enhanced the repeatability and accuracy of porosity results(with a 76.8%reduction in repeatability error).In conclusion,oil washing pretreatment is essential prior to porosity testing in shale oil reservoirs(especially for low-maturity samples);strict control of drying temperature(≤105℃)is critical for obtaining accurate pore volume;and the optimized method(direct measurement of Vp and Vg)effectively addresses error propagation in volume measurement,enabling high-precision porosity testing.关键词
页岩油储层/孔隙度/洗油/烘干温度/孔隙体积/总体积Key words
shale oil reservoir/porosity/oil washing/drying temperature/pore volume(Vp)/bulk volume(Vb)分类
天文与地球科学引用本文复制引用
何思源,李夏伟,杨威,贺育超,张建伟,张烨毓..页岩油储层孔隙度测试方法优化及在四川盆地侏罗系中的应用[J].岩矿测试,2026,45(1):73-85,13.基金项目
四川省自然科学基金项目(2024NSFSC0818) （2024NSFSC0818）
